Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dd1b90da9a47d41…

MALICIOUS

PDF

65.0 KB Created: 2021-03-09 19:37:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f51c29095ae0cc79f2af1ab304250542 SHA-1: 74efd78676d440ebd5c165abb573f720f4feec05 SHA-256: 9dd1b90da9a47d41bb68728720798d91f5ac7c35243a243b24b345b987d9e4f4
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, indicating it functions as a link farm designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and embedded URIs point towards a common tactic of using document content to drive traffic to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://xezojetit.ru/award?keyword=achievers+a1+pdf PDF link annotation
    • https://disaxugotusineg.weebly.com/uploads/1/3/1/8/131871710/9128037.pdfIn PDF document text
    • https://zatitudebijozi.weebly.com/uploads/1/3/4/4/134460539/ab7c503d.pdfIn PDF document text
    • http://nomenowunesazoz.scienceontheweb.net/pugoxirufixogodi.pdfIn PDF document text
    • https://werevofapopaja.weebly.com/uploads/1/3/4/4/134492388/6112953.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369495/normal_5ffb0d273d9b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421208/normal_60005ae4e8ed1.pdfIn PDF document text
    • https://nuvisinuxaxo.weebly.com/uploads/1/3/1/3/131383681/xosivoxaba_sonuboka.pdfIn PDF document text
    • https://kuribigewisowe.weebly.com/uploads/1/3/4/6/134688213/zefenikojudeninow.pdfIn PDF document text
    • https://xikewewojan.weebly.com/uploads/1/3/4/0/134095915/zefeziri_kafazotiwezu.pdfIn PDF document text
    • https://falojaba.weebly.com/uploads/1/3/0/7/130776150/xereg.pdfIn PDF document text
    • http://rawitotizoxuk.scienceontheweb.net/how_to_read_my_birth_chart.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0e818273-c791-4c7a-b20f-750474b78fe4.filesusr.com/ugd/362633_8a35ce9999434fd79d60ba9398bed624.pdf?index=trueIn PDF document text
    • https://f6180879-d31b-499c-8e42-fead7842c491.filesusr.com/ugd/007227_ce707a5f0cdd474099f2102edac4a79a.pdf?index=trueIn PDF document text
    • https://85d2c5a2-fc31-4f76-86b4-4ebe2abe2bf4.filesusr.com/ugd/a8cc01_66b499b0be614c4fab7fe4f4c2959d3e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/vulepekepasakasaximuvitij.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/best_app_to_free_audio_books.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/94409532705.pdfIn PDF document text
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_ba6f3f95aa9247efad5311ad44bcaf99.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F0 5312 bytes
SHA-256: c729e6b980cb8d8f5d5741c2baa21f430a29c3f245c12176a43b997ad2cd04c7
font_01_sfnt_off0000d50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50D 9944 bytes
SHA-256: d7eeaeaf5185bb249e459aaaa4ba4729208a41727d761db22647d10a4b0ccd71

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